Correct Answer: D
Explanation:
The candidate must have kept calm in a situation where others had become annoyed. In other words she behaved with �propriety� and �decorum� (both of which mean good, correct behavior) when others were �unseemly�. Note that �unseemly� (unsuitable, inappropriate) is an important clue. [pertinacity = persistence; adroitness = skill; alacrity = speed and eagerness]